GB1028304A - Improvements in or relating to facsimile systems - Google Patents

Improvements in or relating to facsimile systems

Info

Publication number
GB1028304A
GB1028304A GB5040/63A GB504063A GB1028304A GB 1028304 A GB1028304 A GB 1028304A GB 5040/63 A GB5040/63 A GB 5040/63A GB 504063 A GB504063 A GB 504063A GB 1028304 A GB1028304 A GB 1028304A
Authority
GB
United Kingdom
Prior art keywords
circuit
signal
level
transistor
pulses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5040/63A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AB Dick Co
Original Assignee
AB Dick Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AB Dick Co filed Critical AB Dick Co
Publication of GB1028304A publication Critical patent/GB1028304A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/36—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device for synchronising or phasing transmitter and receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimiles In General (AREA)
  • Facsimile Image Signal Circuits (AREA)
GB5040/63A 1962-02-26 1963-02-07 Improvements in or relating to facsimile systems Expired GB1028304A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US175445A US3223778A (en) 1962-02-26 1962-02-26 Facsimile system

Publications (1)

Publication Number Publication Date
GB1028304A true GB1028304A (en) 1966-05-04

Family

ID=22640243

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5040/63A Expired GB1028304A (en) 1962-02-26 1963-02-07 Improvements in or relating to facsimile systems

Country Status (5)

Country Link
US (1) US3223778A (fi)
BE (1) BE626969A (fi)
DE (1) DE1412727B2 (fi)
GB (1) GB1028304A (fi)
NL (1) NL287137A (fi)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394220A (en) * 1963-12-11 1968-07-23 Xerox Corp High resolution circuitry for facsimile transmission
US3394222A (en) * 1963-12-11 1968-07-23 Xerox Corp Facsimile communication system
US3394221A (en) * 1963-12-11 1968-07-23 Xerox Corp Noise level circuitry for facsimile transmission
US3472958A (en) * 1966-08-01 1969-10-14 Xerox Corp Facsimile system
US3564140A (en) * 1966-10-03 1971-02-16 Nippon Electric Co Phase detection and synchronizing system for facsimile and the like
US3792927A (en) * 1967-08-17 1974-02-19 Bunker Ramo Scanning means having dead-time compensation for interrupted scanning periods
GB1332891A (en) * 1969-10-31 1973-10-10 Image Analysing Computers Ltd Image analysis
US3641259A (en) * 1970-08-03 1972-02-08 Hazeltine Corp Flarelight compensator
US3761610A (en) * 1971-02-16 1973-09-25 Graphics Sciences Inc High speed fascimile systems
US3723649A (en) * 1971-04-27 1973-03-27 Electronic Image Syst Corp Adaptive binary state decision system
DE2430762A1 (de) * 1974-06-26 1976-01-15 Gruner & Jahr Verfahren zur informationsverarbeitung fuer die herstellung einer druckform und vorrichtung zur durchfuehrung des verfahrens
NL175777C (nl) * 1977-05-27 1984-12-17 Nederlanden Staat Schakeling voor de eliminatie van de achtergrondhelderheidsvariatie van een videosignaal.
US4227218A (en) * 1978-12-14 1980-10-07 Exxon Research & Engineering Co. Method and apparatus for generating a digital facsimile signal
US4468705A (en) * 1981-12-07 1984-08-28 Exxon Research And Engineering Co. Data transition enhancement
US5025480A (en) * 1987-03-23 1991-06-18 Eastman Kodak Company Background referencing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730567A (en) * 1950-06-15 1956-01-10 Times Facsimile Corp Facsimile scanning method and apparatus for predetermined signal output and contrast
BE533494A (fi) * 1953-11-20
US2855513A (en) * 1955-11-30 1958-10-07 Ibm Clipping circuit with clipping level automatically set by average input level
US2999925A (en) * 1959-01-28 1961-09-12 Page Comm Engineers Inc Variable decision threshold computer

Also Published As

Publication number Publication date
US3223778A (en) 1965-12-14
BE626969A (fi) 1963-05-02
DE1412727A1 (de) 1968-10-10
DE1412727B2 (de) 1970-07-30
NL287137A (fi) 1965-02-25

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